波-流联合作用下弹性管振动响应研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (20) : 128-139.

论文

波-流联合作用下弹性管振动响应研究

王金诺，陈正寿

作者信息 +

A study on vibration response of a flexible pipe subject to wave-current coupled effect

WANG Jinnuo，CHEN Zhengshou

Author information +

文章历史 +

摘要

由海流和波浪联合作用所引起的涡激振动是导致海洋立管等细长海洋结构物疲劳破坏的重要诱因，不过目前尚缺乏沿管轴向流致和波致振动特性分析的研究。本文采用流体体积法（VOF）捕捉自由液面，建立数值波浪水池，基于双向流-固耦合技术开展了波-流联合作用下弹性管的数值仿真，对比分析了波-流载荷对弹性管振动特性的影响。在波浪作用下，管振幅随KC数增加呈逐步增大趋势，顺流向与横流向的振动频率为波频倍数；波浪力集中作用在自由液面附近，使得沿管轴向的时均流体力系数在不同管段范围呈现不同的分布特性。在波-流联合作用下，振幅随外流速的变化趋势与单独外流的振动响应相一致，振动位移较波浪作用下的情况更为规则；顺流向的振动频率仍由波频主导，横流向激发出一个主频和两个显著次频，且主、次频的差值为波频倍数。最后对比了波浪、波-流联合作用下四个典型波浪位置处沿管轴向的尾流涡街模式，外流的参与加快了旋涡的泄放，同时也是控制泄涡发放类型的主导因素。

Abstract

The vortex-induced vibration triggered by the coupled effect of wave and current plays an important role in causing the fatigue damage to slender and flexible marine structures such as marine risers, however the study about the characteristics of axial hydrodynamic associated with the wave-induced and current-induced vibrations along the pipe is still scare. In this paper, the volume of fluid (VOF) method is used to capture the free surface, and the numerical wave tank is established. Based on a two-way fluid-structure coupling method, the simulations of a flexible pipe system subject to the wave-current coupled effect are carried out, and then a comparative analysis about the effects of wave and current loads on the pipe’s vibration characteristics is performed. The results about cases subject to wave load show that the vibration amplitude of the flexible pipe increases gradually with KC number, and that the apparent frequencies corresponding to the in-line and cross-flow dominant vibration modes are multiples of those associated with incident wave. The wave force is significant near the free surface and the axial time-averaged values of hydrodynamic coefficient show various distribution features along different pipe segments. In the case of wave-current imposed simultaneously, the corresponding variation trends of amplitude are consistent with those related to the cases subject to current only. Subsequently, the corresponding displacements become more regular than those observed in which only wave load is applied. The in-line frequency is predominated by the wave frequency, and the cross-flow vibration frequency is characterized by a dominant frequency and two subordinate frequencies. It is worth noting that the discrepancies between dominant frequency and two subordinate frequencies are multiples of the wave frequency. Finally, comparing the vortex patterns along the pipe span related to four typical locations in the cases subject to wave and wave-current loads respectively, it is found that the presence of the current can accelerate the vortex release and also act as a key factor to control the type of vortex shedding.

导出引用

王金诺, 陈正寿. 波-流联合作用下弹性管振动响应研究[J]. 振动与冲击, 2024, 43(20): 128-139

WANG Jinnuo, CHEN Zhengshou. A study on vibration response of a flexible pipe subject to wave-current coupled effect[J]. Journal of Vibration and Shock, 2024, 43(20): 128-139

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